Furnace-door



(No Model.) 2 Sheets-Sheet 1. O. K. PIGKLES. FURNACE DOOR.

No. 521,447. Patented June 12, 1894.

Fries.

CHARLES K. PICKLES, OF ST. LOUIS, MISSOURI.

FuaNA'cE oooR.

easement-on forming part of Letters Patent No. 521,447, dated June 12,1894. I

Application filed Decanter 26,1893. Serial No 494.769. (no man.)

T all whom it may camera-.-

3'e it known that I, CHARLES K. PIo'KLns, a c t zen of the UnitedStates, residing in the city of St. Louis and State of Missouri, haveinvented a certain new and useful Improvement in Draft ControllingFurnace-Doors, of which the following is a specification.

My invention relates to'fu1*n'a'ce doors, and has for its principalobjects to control the draft both as to the quantityand the course ofthe air fed to the fuel, and to adapt the door for use as a screen orshield.

To these ends, my invention consists princlpally in securing the door tothe furnace front in such a way that either end of said door separatelyor both ends simultaneously may be moved away from the furnace front.

It consists also in a duplex hinge fixed at one end to the furnace frontand at the other to the door; and it consists further in the details ofconstruction hereinafter described and p claimed.

In theaccompanying drawings, which form a part of this specification,Figure 1 is aperspective front view of a furnace door connected by aduplex hinge to a frame adapted to be fastened to the stove front; thedoor being shown partially open and parallel with said frame. Fig. 2 isa similar perspectiveview showing the door wide open. Fig. 3 is a planview with the door in the position shown in Fig. 1. F g. 4. is anelevation showing the door closed. Flg. 5 is a vertical section on line55 of Fig. 4.; and Fig. 6 is a rear view of the door shown in Fig. 4.

The door 1 corresponds in shape to but is preferably slightly largerthan the opening in the furnace or stove, and is pivotally connectedabout its middle vertical line with a horizontal arm or arms 2, whichare likewise pivotally connected to the stove or furnace front 4. or toa frame 3 adapted to be secured to the furnace front. The particularmeans of effecting a pivotal connection is comparatively unimportant, asany suitable duplex hinge will answer this purpose. The drawings showthe horizontal arms Z'seoured by apintle like an ordinary door to carsor lugs on the frame 3, while a long pintle 5 extends downwardly throughholes provided therefor in'the door and the outer endsof said arms. Bythis duplex or double-hinged construction, the door may be swung o'penlike adoo'r with an ordinary hinge. It may also be swung out so as torest parallel with the stove front, in which 5 case air is admittedequally on all sides thereof or it may be so swung that the end oppositethe hinge on the frame is closed while the end next to said hinge isopen, in which case air is fQd tO the fuel on the side near said hinge.This operation results from the pivotal connection of the door to thehorizontal arms, whereby when the arms are swung away from the furnace,the door may be swung on its pivotal connection with said arms to bring6 5 either end thereof against the furnace front.

The arrows in Fig. 3 indicate the several directions of motion of whichthe device admits when the arm'sare swung open. In these severalpositions, of the door, the draft of air traverses different courses, sothat by shifting the door the draft may readily be directed where it ismost desired, and a more even combustion obtained throughout thefire-pot. To

attain the best results, the ends of the opening should be approximatelystraight, so that the area of the opening at the end uncovered by thepivotal movement of the door may be more compact and the draft therebyconfined to closer limits.

It may be desirable to provide the door with an opening in its facecontrolled by an ordinary register damper 6 and also with a shield plate7 on its inner side. When the shield plate is used, it should be removedor stand 8 5 out from the main body to make an air space, and should beprovided with slots therein to accommodate the swinging arms, as shownin Fi 6.

The duplex hinge described is thebest con- 0 struction known to me forshifting the door into the several positions for controlling the draft.Obviously, however, it is practicable to make the door assume suchpositions by other mechanical connections, and for that 5 reason I donot wish to restrict my claims to such duplex hinge.

What I claim as new, and desire to secure by Letters Patent, is

1. The combination with a furnace provided [00 with an opening, of adoor for said opening adapted to uncover either end of said openingseparately and both ends together, substantially as described.

2. The combination with a furnace provided with an opening whose endsare approximately straight, of a door for said opening connected to saidfurnace bya duplex hinge, whereby it is adapted to control the amountand course of the draft, substantially as described.

33. The combination with a furnace provided with an opening whose endsare approximately straight, of a horizontal arm pivotally securedthereto, and a door pivotally secured to the end of said arm, allsubstantially as and for the purposes set forth.

4. The combination with a furnace provided with an opening whose endsare approximately straight, of a horizontal arm pivotally securedthereto, and a door pivotally secured on its inner face to the end ofsaid arm, all substantially as and for the purposes set forth.

5. The combination with a furnace provided with an opening whose endsare approximately straight, of an arm pivotally secured to said furnaceand a door for said opening pivotally secured near its middle portion tothe end of said arm, all substantially as and for the purpose set forth.

6. The combination With a furnace provided with an opening whose endsare approximately straight, of a door for said opening connected to thefurnace by a duplex hinge and having a handle in the central frontportion thereof, all substantially as and for the purposes set forth.

7. The combination with a furnace, of a door connected therewith by aduplex hinge, said door having an opening in its face plate and having alining plate slightly removed from the face plate thereof, substantiallyas described.

S. A furnace door frame provided with lugs and an arm having pintlesengaging said lugs, the outer end of said arm being pivotally connectedto the middle portion of the door, substantially as described.

CHARLES K. PICKLES.

Witnesses:

T. PERCY CARR, WM. H. SCOTT.

